error building poke-mode.elc

[Bruno Haible]

Building the current master branch on a system with Emacs 24.5.1,
I get this error:

========================================================================
make[2]: Entering directory '/media/develdata/devel/POKE/poke/etc'
if test 'emacs' != no; then \
  am__dir=. am__subdir_includes=''; \
  case poke-mode.elc in */*) \
    am__dir=`echo 'poke-mode.elc' | sed 's,/[^/]*$,,'`; \
    am__subdir_includes="-L $am__dir -L ./$am__dir"; \
  esac; \
  test -d "$am__dir" || /arch/local/x86_64-linux/bin/mkdir -p "$am__dir" || 
exit 1; \
  emacs --batch \
      \
    $am__subdir_includes -L . -L . \
    --eval '(if (boundp (quote byte-compile-dest-file-function)) (setq 
byte-compile-dest-file-function (lambda (_) "poke-mode.elc")) (defun 
byte-compile-dest-file (_) "poke-mode.elc") )' \
    -f batch-byte-compile 'poke-mode.el'; \
else :; fi
Loading 00debian-vars...
Loading /etc/emacs/site-start.d/50autoconf.el (source)...
Loading /etc/emacs/site-start.d/50cmake-data.el (source)...
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
Loading debian-ispell...
Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...
Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...
Loading /etc/emacs/site-start.d/50gnugo.el (source)...
Loading /etc/emacs/site-start.d/50python-docutils.el (source)...

In toplevel form:
poke-mode.el:169:1:Error: rx form `regexp' requires args satisfying `stringp'
make[2]: *** [Makefile:2022: poke-mode.elc] Error 1
========================================================================

Since Emacs is now a build prerequisite, it should be mentioned in the
third section of the DEPENDENCIES file.

Bruno